Theoretical and Experimental Study on Trans-Scale Properties of Soil Strength

Fang, Ying; Feng, De Luan; Gu, Ren Guo; He, Zhongwei

doi:10.4028/www.scientific.net/amr.779-780.394

Cited by 2 publications

(1 citation statement)

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“…In the present work, based on the Eshelby-Mori-Tanaka equivalent inclusion and average stress principle, we realizes the quantitative correlation between the matrix shear stress in the soil-rock mixture and the mechanical response of the pure matrix material, and establishes the constitutive relationship and finite element equation of the soil-rock mixture with embedded intrinsic scale parameters through the couple stress theory. Hu et al (2013) and Fang et al (2013) have respectively derived the effective elastic modulus of pebble soil and the equivalent effect gradient of cohesive soil by using the Eshelby equivalent inclusion principle, and obtained good theoretical results. According to Eshelby equivalent inclusion principle (Eshelby 1957), the shear stress of the soil matrix and the rock block in the representative volume element (RVE) of the soil-rock mixture can be expressed as:…”

Section: Multi-scale Coupled Shear Strength Theoretical Model Of Soil...mentioning

confidence: 99%

A multiscale finite element method for soil-rock mixture

Liu¹,

Dong

2023

Front. Mater.

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Soil-rock mixture is a complex multi-phase composite geotechnical material, and its strength is determined by the physical properties of constituent multi-phase materials and their coupling mechanical response between different phases of materials. Based on the Eshelby-Mori-Tanaka equivalent inclusion average stress principle, a theoretical model of multi-scale coupled shear strength of soil-rock mixture considering the interaction effect of rock block and soil is established, and the rotational freedom reflecting the microscopic motion details of rock block is introduced. Moreover, a multi-scale coupled constitutive relationship of soil-rock mixture is derived and compiled into a multi-scale finite element program. Based on the large-scale direct shear test of soil-rock mixture, the model parameters of the multi-scale finite element method are determined, and then the multi-scale finite element program is used to simulate and predict the cross-scale deformation process of the soil-rock mixture slope. The results show that the multi-scale finite element method can effectively describe the influence of the mechanism of the micro motion characteristics of the soil-rock mixture on the macro mechanical response, and can effectively overcome the pathological mesh-dependency of the classical finite element method; the rotation displacement of the rock block is mainly concentrated within the shear zone of the slope. The maximum rotational displacement of rock blocks inside the soil-rock mixture slope is 40.7°, and the rotational displacement of rock blocks outside the shear zone is about 0°. The physical mechanism of the cross scale evolution of the shear band of the soil-rock mixture slope is that: the rotation of the rock blocks weakens the strain transmission ability between the rock block and the matrix soil, thus forming the concentration and development of the plastic strain, and finally leading to the penetration of the shear bands of the slope and the overall sliding failure.

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Section: Multi-scale Coupled Shear Strength Theoretical Model Of Soil...mentioning

confidence: 99%